Cylinder-grinding tool



Sept. 2, 1930. H. c. HEON 1,774,711

. CYLINDER GRINDING TOOL Filed March a, 1927 2 Sheets-Sheet 1 v l I; /6 /9I Zizvewzforx v wfi ubmwwwwij Patented Sept. 2, 1930 UNITED STATES PATENT OFFICE I HORACE O. HEON, OF CHIGAGO,-ILLINOIS, ASSIGNOR 'IO AUTOMOTIVE MAINTENANCE MACHINERY 00., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS CYLINDER-GRINDING TOOL Application filed March 3, 1927. Serial No. 172,393.

Cylinder grinding tools are known, for grinding the cylinders of engines, pumps, and the like to present a true and highly finished surface, in which a plurality of abrading stones are spring-urged outwardly from a suitable frame or bodyrso that suchstones may effectively press against the cylinder wall in operation. For instance, my prior Patent No. 1,522,720 granted January 13, 1925, shows a cylinder grinder of this general class. Among the general objects of my invention are to improve upon cylinder grinders of this class by novel stop-provision for adjustably limiting the .maximum outward spread of the stones, thereby predetermining the bore-diameter at which the grinding action of the' tool will cease; and also to make novel provision for manually contracting the spread of the stones to less than that for which the limiting stop aforesaid is set, thereby to facilitate insertion of he tool into the cylinder to be ground. Other objects of my invention are to provide simple, inexpensive, and easily-manufactured construction for these purposes and to make the same in a form suitableto be applied to the tool shown in my prior patent aforesaid; and other and further ob'ects will appear to those skilled in the art from the following description taken in conjunction with the accompanying drawings wherein:

Figure 1 is a side elevation of a tool embodying my invention. 7 V

Fig. 2 is a plan view thereof, with the stem in section, viewed from the line 2-2 of Fig; 1.

Fig. '3 is a longitudinal vertical section of line 33 of Fig. 2.

Fig. 4 is a horizontal section on, line 44 of Fig. 1,'especially illustrating the adjustable spreaddimiting means, and with the abrading stones in the widest-spread position permitted by the adjustment shown.

Fig; 5 is a similar view showing the same parts in a different position, the stones being in contracted position to which they are drawn by operation of the manually-manipulated tool-contracting means.

Fig. 6 is a section on line 6 6of Fig. 1, particularly illustrating the stone spreading spring structures against tracting means work, and

Fig. 7 is a fragmentary View with the limiting-stop parts seen from sectionline 7-7 of Fig. 4 and with other parts broken away.

In the drawings 10 indicates the abrading stones, preferably four or morein number, spaced at equal intervals about the axis of the tool-body, and each mounted in the external channel of its individual carryingmember or wing 11, near theouter, free edge thereof. Each wing is pivoted, at or near its inner edge, to a pair of arms, 12 that project radially from a central body member 13 near the top and bottom thereof; 14 being the pivot-shafts, extending the full length of said wings. Spring means, suitably arranged, tend to throw the wings outward about their pivotal axes to maximum spread, the construction shown having springs 15 for this purpose, each coiled around'a respectivepivot-shaft 14 and each pressing, at its opposite ends respectively, against the body 13 and the inner face of the corresponding wing 11. 1

It is desirable that under all-conditions the wings 11, and consequentlythe abrading stoneslO, shall move in harmony, present ing the stones at equal radial "distances from the axis of the tool throughout the entire length of the stones. Also it is desirable that which the conall of the stones shall be under contr'olof a single limitation-stop member, so that adjustment of only one stop-member is necessary to set the maximum permissive throw of t-he stones. Andfurther it is desirable that 'all of the stone-carrying j members or wings should be retractible in unison against the tension of said springs 15 by operationofa single manually operable retractingdever.

Toward all of these ends the wings areinten,

connected by an equalizing structure 16 at the upper end of the tool (and whichis preferably duplicated at the-bottom end, forfdistribution ofstrain) such equalizer structure 16 being preferably one involving a part that must move rotatively with respect to the axis of the tool, forwardly or clockwise as the 1nterconnected w1ngs swing out to expanded position and backwardly as the wings to the pressure of springs 15.

are forced in to contracted position. In the form shown, each wing has an equalizer-link 17, the forward end of which is pivoted at 18 in a recess 11 in the wing near the outer edge thereof (see Fig. 2). The inner or rear end of each such link is connected to a collarstructure 19 by a pivot-stud 20, the collar 19 being preferably made up of two plates enibracing the rear ends of the several links and united by said pivot-studs, and said collar being rotatably mounted on a reduced stcmportion 13 of the body As the wings swing out, or are forced in, the collar must accordingly rotate slightly forward, or turn backward, about the axis of the tool.

The construction thus far described, and which I preferably employ, is substantially that set forth in my said prior patent, but the improvements hereinafter set forth may be applied to other constructions differing therefrom in detail.

F or adjustably setting the maximum expansion-limit of the tool, I employ a stopmember 22 adjustable to stop, in different positions, the forward, spring-urged rotary movement of said equalizer-structure 1G with respect to the body of the tool. And for manually contracting the tool to a diameter for easy insertion into the cylinder to be ground, I employ manipulative means, as lever 85, arr: nged for easy accessibility and acting with great leverage, to force c equalizer system backwardly about the axis of the bodythat is, in a direction counter And such con tracting lever I preferably cause to act through the stop-member 22 aforesaid, so that the contraction will be to a predetermined extent from the diameter-setting, however that setting stands adjusted.

Specifically, some suitable part of the wing-and-equalizer system carries an upwardly projecting abutment-member such as lug or stud 21; it being preferably a prolongation of one of the pivot studs 20 of the equalizer system (as best shown in Fig. 3) and therefore being in substance a part of the collar 19. As the stone-carriers 11 swing outward under the urge of their springs 14''; the forward movement of the stop-lug 21 about the axis of the tool is clockwise of Fig.

4. An adjustable limiting member, such as stop-screw 22, is arranged in the forward ably arranged to receive the universal joint or other suitable driving connection, 26. A rotarily shiftable member or ring 27 surrounds the lower portion of the sleeve, the ring and sleeve being jointly recessed from below, as at 28, to receive the stop-stud 21, and the stop screw 22 being threaded through said ring tangentially, to enter said recess for coaction with stud 21. A pin 30 projecting from fixed sleeve 2 1 engages a horizontal slot 31 in the ring 27, so as to permit slight rotative displacement of the ring counter-clockwise with respect to the sleeve. The toolcontracting lever is operable to compel counter-clockwise displacement of this ring 27 relative to the sleeve 24, thus causing the sto screw 22 to press the abutment-stud 21 of the equalizer system 15 backwards, and thereby retracting the connected wings 11 to a spread less than that for which the limitation stop screw 22 is set. Specifically, 33 1 and 4) is a short vertical shaft crossing the slot 31 and provided with a cam projection 23% to coact with the pin or projection 30 of the sleeve 2%. Above the ring member 27 the shaft 33 has a lever extension 85 that is of curved shape to fit around the sleeve 24 and is provided with a finger piece In normal position, shown in full lines in Fig. 2 the lever is snapped over a small boss 36 as a latching arrangement, and in this position. the cam 3i located shown in 41:, with its lowest part acting against the thrust pin 30. ll hen thrown into dottcd line position, Fig. 2, the lever 35 turns shaft 33 so that the cam 3i rides to its highest position against the pin 30, as shown in Fig. 5, and (being on dead center) will stay there until lever 35 be returned to normal position. The result is contraction of the diameter of the tool from a. maximum setting as shown in Fig. l to a position as shown in Fig. 5; the dotted circle in both of these figures representing the maximum spread of the tool permitted by the particular adjustment of stop screw 22.

In resum of operation, the stone-carrying wings 11 are urged outwardly by springs 15 and are interconnected, so as always to move in unison, by the equalizing links 17 and collar 19, which collar must turn somewhat about the body-stem 13" as the *ings expand or contract. The controlling head 23 (including its ring-portion 27) is so secured to stem 13 as to be normally held against turning clockwise about said stem, and it carries the adjustable stop screw 22 to engage the projecting stop-lug 21 of the equalizer tem, thereby to predetermine the maximum diameter to which the tool will expand. The tool-contracting lever 35 operates the vertical cam-shaft 33 mounted in ringuneinber 27 of said controlling head 23, so that as said lever is moved from full line to dotted line position, Flg. 2, it throws the cam 3% from position shown in Fig. .4 to that shown in Fig. 5, camming the ring 27 of said controlling head counter-clockwise, whereby the stop-screw 22 will force the stop-lug 21, and consequently the whole equalizer system 16 for the wings ll, backwardly to contract the wings, decreasing the diameter of the tool to such extent that it may readily be inserted into the cylinder to be ground. It will be observed that the tool-contracting lever is so located, above the level of the stone-carrying wings, that it may easily be manually operated even When the stones have been inserted into the cylinder to be ground, and also that the limitation-stop-screw 22 is likewise conveniently located for easy adjustment whether the tool is partly in the cylinder to be ground or Wholly removed therefrom.

It will be understood that while I have described in some detail a particular preferred embodiment of my invention, many changes in construction and arrangement of parts may be made without departure from the spirit of my invention and within the scope of the appended claims.

I claim:

1. The combination with a cylindergrinding tool having a body, movable stonecarriers, and-spring-means urging said stonecarriers toward expanded position, of equalizing means connecting said stone-carriers for unison movement and involving a member pivotally associated with said stonecarriers and rotatable about the axis of the tool when the stone-carriers move to expand or contract said tool, and adjustable means for limiting the rotative movement of said rotatable member in one direction, thereby adjustably to limit the maximum expansion of said tool.

2. The combination with a cylinder grinding tool having a body, movable stone-can riers, and spring-means urging said stonecarriers toward expanded position, of equalizing means connecting said stone-carriers for unison movement and involving a collar rotatable about the axis of said tool when the stone-carriers move to expand or contract the tool and said collar having a projecting stoplug, and an adjustable tangential stopscrew positioned by the tool body and acces sible for adjustment from the exterior thereof, said stop-screw being arranged in the plane of movement of said stopabutment on the collar for adustably limiting the maximum expansion of said tool by limiting the movement of said stop-abutment in tool-expanding direction.

3. The combination with a cylinder-grinding tool having a body, movable stone-carriers, spring-means urging said stone-can riers toward expanded position, and equalizing means connecting said stone-carriers for unison movement and involving a member rotatable forwardly or backwardly about the axis of the tool as the stone-carriers move to respectively expand or contract the tool, of a controlling head structure comprising a sleeve fast on said body, a ring member rotatively movable about said stem, adjustable stop-means carried by said ring member and interposed in the path of movement of a part of the said equalizing means, and manipulative means for camming, said ring-member backwardly, to contract the spread of the stone-carriers without altering the adjust ment of said stop-means.

a. The combination with a cylinder-grinding tool having a body, movable stone-carrying wings pivoted thereto, and spring-means urging said stone-carriers toward expanded position, of equalizing means connecting said stone-carriers for unison movement and involving a collar rotatable about the axis of the tool as the stone-carriers move to expand or contract the tool, a controlling head mounted on the tool body and involving a ring-member slightly rotatable with respect to the tool-body, an adjustable stop-screw carried by said ring member and co-acting with a part of the equalizer-collar to limit the movement of said equalizing collar and consequently the wing-members in tool-expand ing direction, and lever-means on said controlling head for camming said ring member and adjustable stop-member in tool-contracting direction'without altering the adjustment of said stop-member.

5. The combination with a cylinder-grinding tool having a body, movable stone-can riers and spring means urging said stone-carriers toward expanded position, of a head carried by said body beyond one end of the stone-carriers, a hand-lever pivotally mounted on said head and means including a camming device co-acting with said hand-lever and with all of said stone-carriers to force the latter toward contracted position as said hand-lever is moved in one direction.

In testimony whereof, I have subscribed my name.

HORACE C. HEON. 

